How to use urllib with username/password authentication in python 3? - python-3.x

Question

Here is my problem with urllib in python 3.
I wrote a piece of code which works well in Python 2.7 and is using urllib2. It goes to the page on Internet (which requires authorization) and grabs me the info from that page.
The real problem for me is that I can't make my code working in python 3.4 because there is no urllib2, and urllib works differently; even after few hours of googling and reading I got nothing. So if somebody can help me to solve this, I'd really appreciate that help.
Here is my code:
request = urllib2.Request('http://mysite/admin/index.cgi?index=127')
base64string = base64.encodestring('%s:%s' % ('login', 'password')).replace('\n', '')
request.add_header("Authorization", "Basic %s" % base64string)
result = urllib2.urlopen(request)
resulttext = result.read()

Answer 1

Thankfully to you guys I finally figured out the way it works.
Here is my code:
request = urllib.request.Request('http://mysite/admin/index.cgi?index=127')
base64string = base64.b64encode(bytes('%s:%s' % ('login', 'password'),'ascii'))
request.add_header("Authorization", "Basic %s" % base64string.decode('utf-8'))
result = urllib.request.urlopen(request)
resulttext = result.read()
After all, there is one more difference with urllib: the resulttext variable in my case had the type of <bytes> instead of <str>, so to do something with text inside it I had to decode it:
text = resulttext.decode(encoding='utf-8',errors='ignore')

Answer 2

What about urllib.request ? It seems it has everything you need.
import base64
import urllib.request
request = urllib.request.Request('http://mysite/admin/index.cgi?index=127')
base64string = bytes('%s:%s' % ('login', 'password'), 'ascii')
request.add_header("Authorization", "Basic %s" % base64string)
result = urllib.request.urlopen(request)
resulttext = result.read()

Answer 3

An alternative using OpenerDirector that installs the auth headers for all future urllib requests
login_pass = base64.b64encode(f'{login}:{password}'.encode()).decode()
opener = urllib.request.build_opener()
opener.addheaders = [('Authorization', f'Basic {login_pass}')]
urllib.request.install_opener(opener)
response = urllib.request.urlopen(API_URL)
print(response.read().decode())
A further example using HTTPBasicAuthHandler although a bit more work required if need to send credentials unconditionally:
password_mgr = urllib.request.HTTPPasswordMgrWithPriorAuth()
password_mgr.add_password(None, API_URL, login, password, is_authenticated=True)
auth_handler = request.HTTPBasicAuthHandler(password_mgr)
opener = request.build_opener(auth_handler)
request.install_opener(opener)
response = urllib.request.urlopen(API_URL)
print(response.read().decode())